A Missouri woman used antifreeze to fatally poison her husband and then set their home on fire with his body still inside so she could marry a convicted murderer serving life in prison, according to reports.

Amy Murray, 40, was working as a nurse at the Jefferson City Correctional Center when she was having an affair with inmate Eugene Claypool, Fox 22 reported.

Murray allegedly started a fire inside her Iberia home on Dec. 11 and first responders found the body of Murray’s husband, Joshua Murray, inside, cops said.

Fire marshals determined that the blaze originated inside the master bedroom and that an accelerant was used to start the inferno, according to the Miller County Sheriff’s Office.

An autopsy concluded that Joshua was dead before the fire started and that he was poisoned with antifreeze.

Murray was charged with first-degree murder and armed criminal action in connection with her husband’s death, authorities said.

After Murray allegedly started the fire, she went to a McDonald’s with her 11-year-old son and dogs, according to the news outlet.

Court documents revealed that Murray had recorded phone conversations with Claypool in which she stated that she did not want to be married to her husband anymore, Fox 22 reported.

She added that she could marry Claypool because Joshua was dead and “out of the picture,” the report said. Murray even reportedly talked about getting an attorney to try to get Claypool released early.

Claypool is serving life in prison for fatally stabbing a 72-year-old Missouri man who won a lottery jackpot of $1.7 million.

Murray was being held at the Miller County Adult Detention Center on $750,000 bond.